Chapter 10

Question 1

The ____ layer is closest to the end user

Answer 1

application

Question 2

____ protocols help exchange data between programs running on the source and destination hosts.

Answer 2

application layer

Question 3

Name four common application layer protocols.

Answer 3

HTTP, FTP, TFTP, DNS

Question 4

The presentation layer does what three functions and common graphic image formats

Answer 4

formats, compresses and encrypts data - GIP, JP, PNG

Question 5

____ layer creates and maintains dialogs between source and destination applications.

Answer 5

Session

Question 6

The ____ layer handles the exchange of info to initiate dialogs, keeps them active and to restart sessions that are disrupted or idle for long period of time.

Answer 6

Session

Question 7

Application layer protocols must be implemented on the ___ ,and ____ host must be compatible to allow communication.

Answer 7

source and destination

Question 8

Devices requesting info is called a ___, responding to request the ____.

Answer 8

client and server

Question 9

Client and server processes are considered to be in the ____ layer.

Answer 9

application

Question 10

____ is an example of a client-server interaction.

Answer 10

Email

Question 11

What networking model can access data without a dedicated server and why ?

Answer 11

P2P (peer to peer) connected end devices can function as a server and client, roles set on a per request basis.

Question 12

Some P2P applications use a ___ system

Answer 12

hybrid

Question 13

A ____ allows a web browser to establish a connection to that web server.

Answer 13

URL (uniform resource locator)

Question 14

Using ___, the server name portion of the URL is then translated to the associated IP address before the server can be contacted.

Answer 14

DNS

Question 15

What are the differences between HTTP and HTTPS?

Answer 15

HTTP - a request/respond protocol. Three common message types GET, POT, PUSH. Is not secure.
HTTPS uses authentication and encryption to secure data.

Question 16

Email is a ____ method of sending, storing and retrieving electronic messages.

Answer 16

store and forward

Question 17

Email clients do or do not communicate directly when sending emails?

Answer 17

Do not

Question 18

Email relies on three separate protocols for operation. Name them.

Answer 18

SMTP (sending), POP (retrieivng, and IMAP (retrieving)

Question 19

SMTP client sends an email by connecting to the SMTP server on what port?

Answer 19

25

Question 20

Name two protocols used by email clients to retrieve messages.

Answer 20

IMAP and POP

Question 21

Name some differences in IMAP and POP

Answer 21

POP listens on port 110TOP for client requests; client and server exchange commands and responds until connection is closed or aborted; and emails to be downloaded to device and removed from server.

IMAP messages are displayed rather than downloaded; messages reside on server until manually deleted by the user; and users can create a folder hierachy to organize and store mail.

Question 22

Domain names are created to make the server addresses more ____.

Answer 22

user friendly

Question 23

______ displays all of DNS cached entries

Answer 23

IP config/display DNS

Question 24

DNS protocol uses a ____ system, the the root at top and branches below.

Answer 24

hierarchial

Question 25

Manually configuring end devices is not scalable. ___ allows for automated distribution of network info. ___ distributed addresses are leased for a set period of time.

Answer 25

DHCP and DHCP

Question 26

DHCP operations: (four)

Answer 26

client broadcasts DHCPDISCOVER server replaces DHCPOFFER client sends DHCPREQUEST server returns DHCPACK